Content Marketing

1)  http://www.scoop.it/ (You are the content you publish)
  A) Content Curation Service
  For Professionals: Create and grow your online presence in minutes by publishing curated content.
  B) Content Marketing Automation
  For Marketers, business owners and agencies: Save time producing and promoting content. Get intelligent and actionable recommendations to amplify your results.

2)  https://news.ycombinator.com/
  Hacker News顶级创业者社区，没有任何盈利企图，唯一目的是用它吸引、培养下一批创业者，该社区用户创造的内容质量远远超出其他创业者主题的网站。

3)  http://www.blackhatworld.com/  (Black Hat Seo Forum)
  黑帽世界（Blackhatworld）是一个论坛网站，主要讨论网络营销方面的话题。用户可在此搜索网络营销、性价比较高的产品信息和服务信息。网站主要栏目包括：成员列表，投稿，邀请朋友，论坛，博客，聊天，广告等。Blackhatworld.com是一个大型的社区，汇集了黑帽搜索引擎优化的爱热心者，联盟营销人员，网络营销人员，大家在这儿讨论最新的营销和创汇趋势，一直是成员们讨论最新网络营销和创汇趋势的首选阵地。

4)  https://inbound.org/ (We find and deliver the best marketing articles to you)
  Pick the topics you want to learn about; Receive a daily or weekly email digest; you get to connect with and learn from a community of 170,000+ marketers.

5)  http://buzzsumo.com/  (Find the Most Shared Content and Key Influencers)  
  BuzzSumo has to be a paramount tool for content marketing and SEO campaigns. The ability to quickly identify what content is working well in an industry and who the major influencers are. No other tool comes close to providing the kind of insight that it gives, and is also a great place to see which topics related to your business get the most attention.